transport in cells

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  • transport in cells
    • diffusion
      • no energy required
      • movement of particles in a solution or gas
        • from higher to lower concentration
      • the greater the difference in concentrations the faster the rate of diffusion
      • e.g. gas exchange in the lungs or urea in the kidneys
    • osmosis
      • no energy required
      • movement of particles from a dilute solution to a more concentrated solution
      • e.g. plants absorbing water from the soil
    • active transport
      • energy is required
      • movement of particles from a dilute solution to more concentrated
      • e.g. movement of mineral ions into roots of plants

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